Science Revision

The pumping organ of our circulatory system is

• a) Heart

• b) Kidney

• C) Liver

• d) Stomach

They are pipe-like, consisting of a group of specialised cells. They transport substances and form a two¬way traffic in plants. Which of the following terms qualify for the features mentioned above?

• (a) Xylem tissue

• (a) Vascular Tissue

• (a) Root Hair

• (a) Phloem Tissue

The fluid part of the blood is known as

• a) Plasma

• b) Cells

• c) RBCs

• d) WBCs

Which blood cells are a significant part of the immune system of the body?

• a) Platelets

• b) RBCs

• c) WBCs

• d) None of these

The part of human body which lacks sweat gland is

• a) Lips

• b) Armpits

• c) Hand

• d) Palm

Which blood vessel carries oxygen-rich blood?

• a) Valves

• b) Arteries

• c) Veins

• d) Capillaries

The number of heart beats per minute is called

• a) Throbbing

• b) Beating

• c) Pulse rate

• d) Pumping

Name an instrumental device used to amplify the sound of heart.

• a) UV machine

• b) Stethoscope

• c) Both (a) and (b)

• Ultrasound machine

Soil is the substance which makes up the _________ of the earth.

• a) rock

• b) layers

• c) surface

• d)all of the ebove

Which one of the following is a step in the formation of soil?

• (a) Earthquakes or volcanic eruptions

• (b) Weathering of rocks

• (c) Addition of humus

• (d) All of these